21 techonogical
22 Environmental
23 volcanic
24 cultural
25 caused
26 had visited
27 had bought
28 Did - use
29 was widen
30 being made
31 down
32 on
33 in
34 for
35 of
36 What an interesting book she has!
37 Tim said we would probaly live on other planets in the future
38 The river flowing through our hometown is seriouly polluted
39 Technology in the field of telecommunications was developed rapidly over the past decade
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